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Danube Facts and Figures SLOVENIA

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Danube Facts and Figures SLOVENIA Danube Facts and Figures SLOVENIA (April 2020) General Overview Slovenia covers a territory of 20,273 km2 and is home to just over 2 million people. It is a diverse country in terms of its landscape and climate, being located at the meeting point of four major European geographical regions: the Alps, the Dinaric Mountains, the Pannonian Basin and the Mediterranean (Adriatic Sea). 81% (16,423 km2) of the country is located within the Danube River Basin, which represents 2% of the entire Danube catchment area. Two major Danube tributaries flow through the country, namely the Sava river (along with its tributaries, the Kolpa river and the Savinja river) and the Drava river (and its tributary, the Mura river). Slovenia shares a border with Austria, Croatia, Italy and Hungary and contains 52 km of coastline along the Adriatic Sea. The Convention on Co-operation for the Protection and Sustainable Use of the Danube River was signed by the Republic of Slovenia in December 1994 and came into force in October 1998. Topography The majority of Slovenian terrain is upland, with around 90% of the surface situated at 200m or more a.s.l.. Mount Triglav is the highest peak at 2864m a.s.l.. In terms of landscape diversity, Slovenia is exceptional in that four major geographical regions meet and interweave within a relatively small area. It can therefore be divided into four basic landscape types: Alpine, Dinaric, Pannonian and Mediterranean. 93% of the rock structure is sedimentary, with carbonate sedimentary rock prevailing in western, southern and central areas (mainly limestone and dolomite and including spectacular karst developments). Carbonate rocks in parts of south- western and central Slovenia often include flysch and similar clastic sedimentary rocks. Oligocene, Miocene and Pliocene postorogenetic sediments occur in the north-east and east, as well as small areas of the south-east. Igneous (accounting for 3%) and metamorphic rock (4%: gneiss, mica schist, amphiboles, eclogites, marbles and slates) are found in a small part of north-eastern and northern Slovenia, the majority located at Pohorje, Strojna, Kozjak and Kobansko. Quaternary sediments form an extensive group in the central Ljubljana basin, stretching toward Gorenjska and covering part of the north-east. These sediments have formed a number of smaller basins and plains, predominantly gravel, sand and clay, and are the least resistant to weathering. © ICPDR (International Commission for the Protection of the Danube River) – http://www.icpdr.org Danube Facts and Figures: Slovenia Due to geological and climatic diversity and also the roughness of terrain, Slovenia has a varied soil composition. Various types of rendzina and cambisol, as well as ranker and dystric cambisol, prevail. Extensive plains of Ljubljansko polje, Dravsko-Ptujsko polje, Dolinsko polje and Ravensko polje are covered by dystric cambisol on silicate rock, and eutric cambisol on carbonate gravel and sands. Precipitation, climate and water flow Slovenia can be divided threefold in terms of climate: a temperate continental climate in the central and eastern region (typical monthly averages for Ljubljana of –0.3°C (January;) to 21.3°C (July) with a mean annual precipitation of 1362 mm); an alpine climate to the north-west (averages for Rateče: –3.9°C (Jan) to 17°C (July); mean annual precipitation of 1459 mm); and a sub-Mediterranean climate along the coast and its hinterland (averages for Portorož: 4.3°C (Jan) to 22.9°C (July); mean annual precipitation of 968 mm). All averages are for the 1981–2010 reference period. A strong interaction occurs between the three climatic zones across much of the country. Major variations in the spatial distribution of annual precipitation are characteristic of Slovenia, with the wettest areas receiving as much as four times the amount of precipitation recorded in the driest areas. The highest levels of precipitation occur where warm humid south-westerly air from the Mediterranean reaches the Alpine- Dinaric mountain barrier. Mean annual precipitation exceeds 1600 mm across the entire Dinaric-Alpine zone, increasing to more than 2600 mm where the barrier is greatest – in the upper Posočje and Mount Snežnik areas. Precipitation rates decrease with distance from the mountains: north-east areas have on average less than 900 mm per annum. Rainfall peaks occur at different times of the year in the different climatic areas. In the west, two characteristic precipitation peaks occur – at the end of spring and autumn. To the north-east, where the continental climate predominates, most occurs in the summer. Winter-summer variations occur in the type and duration of rainfall: long lasting precipitation accompanying the passing of a weather front is characteristic of the cold half of the year; short, more intensive showers and storms (often accompanied by hail, strong winds and torrential floods) are characteristic of the summers. In terms of recent variations (from the analysis for the period from 1961 to 2011), the data indicates that Slovenia’s precipitation regime is changing: at the annual level, amount of precipitation in the western part of the county is decreasing at the level 2–4% a decade. In the spring and summer is the decrease almost statistically significant at the national level. It is significant on small areas only in the spring and in summer in the places in the south of the country. In the autumn and winter however, changes are not obvious. Mean annual temperatures in the majority of the country is 8–11°C; increasing to 10–12°C in areas influenced by the continental climate and exceeding 12°C to the © ICPDR (International Commission for the Protection of the Danube River) – http://www.icpdr.org 2 Danube Facts and Figures: Slovenia west in the Slovenian Istria, a part of Kras, the Vipava Valley and Brda. For the majority of the Alpine and Dinaric mountain region, 6–8°C is typical, and in the highest parts of the Julian Alps, the annual mean does not exceed 0°C. Between 1961 and 2019, mean annual temperatures throughout the country increased, with 2010-2019 being the warmest 10-year period. The rise fairly uniform over the whole country (0,36°C a decade), with somewhat greater increase in the eastern parts. The greatest increases was observed in summer and spring, somewhat lower was decrease in winter and no increase being observed in the autumn months. Slovenia is divided into two catchment areas by the Adriatic Sea – Black Sea watershed, with the vast majority (81%; 16,423 km2) belonging to the Danube river catchment area. The total length of the river network is 35,128 km, with the significant rivers being the Mura, Drava, Sava, Kolpa and Savinja, all located within the Danube river basin. Slovenia contains 2% of the Danube catchment area, and the Slovenian Sava and Kolpa river basins represent 12% of the Sava catchment area. Slovenian watercourses are short due to the rough terrain and rock composition, with only 46 longer than 25 km (22% of the network). Rivers exceeding 100km include the Sava (221km), Drava, Kolpa and Savinja rivers. In general, Slovenian rivers form a very dense network but it is not uniform. On areas of impermeable and poorly permeable rocks, the network is dense. The Reka stream, the Sava’s tributary near Litija, has a 96 km2 river basin and a density of 2.8 km/km2. Above the mouth of the Črni potok, the Reka stream has a density of 3.5 km/km2. Sparse river networks occur in the Dinaric region. The high plateaus, for example, have no river network at all. Similar conditions are found in the karstic Alpine area, but areas without river networks are not so extensive. The central part of the gravel flatlands (with deep groundwaters), such as at Kranjsko polje, Sorško polje, Ljubljansko polje and Dravsko polje, also show sparse networks. © ICPDR (International Commission for the Protection of the Danube River) – http://www.icpdr.org 3 Danube Facts and Figures: Slovenia Land use and settlements According to 2018 data, 55.9% of Slovenia is forested (the third most forested country in Europe after Finland and Sweden); 29.0% is arable/permanent crops/ mixed agriculture; 5.3% pastures; 3.5% built-up areas; 2.4% transitional woodland shrub; 1.9% natural grassland/moor; 1.4% other uses and 0.6% comprises water and wetlands. Put simply, forest and herbaceous vegetation covers just under two thirds of the land cover and agriculture just over one third. The largest areas of dense forest cover the Dinaric-Karst plateaus of southern and south-western Slovenia, and in the Alpine region to the north and north-west. In the north-east, agricultural land prevails. Considering land cover changes since the 1970s, afforestation has been identified as the main change in Slovenia and this process is expected to continue and even accelerate in the future due to the selective abandonment and scrubbing up of agricultural land and the transition to predominantly market-oriented agriculture. In 2019, there were 6035 settlements in the country (57 without inhabitants). Small settlements prevail with half containing less than 100 inhabitants (but home to only 6,5% of the population). Only 16 settlements had more than 10,000 inhabitants in 2019, and Ljubljana, the capital, is the only city with more than 100,000 inhabitants. Small settlements are characteristic of the Dinaric plateaus, Dinaric valleys and Alpine hills; large settlements are characteristic of the Alpine and Pannonian plains. Population distribution is uneven and is governed by the hilly terrain; overall population density is classed as medium, at 103 inhabitants per km2 (2019 census). Population density is highest on the Alpine and Pannonian plains and surrounding the major cities and is increasing in these areas (more than tripling on the Alpine plains in the 20th century).
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